JP2002197428A - Film with magnetic code, film with magnetic code having light diffracting structure, sheet having the films and method for manufacturing these - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflection layer having a magnetic code which can not be copied though the layer is visible and having sufficient reflectivity and to provide a light diffracting structure film obtained by applying a reflection layer to the light diffracting structure, etc., or a sheet, such as a card having light diffracting structure obtained by adhering the light diffracting structure film to a body to be adhered. SOLUTION: A film 1 with magnetic code consists of a laminated structure obtained by successively laminating a transparent base material film 2, a protective layer 7, a light diffracting structure layer 8, a pattern layer consisting of the code pattern 3p of a magnetic metallic film and the non-coding pattern 4p of a high reflective metal film, a projecting pattern 5 on the lower face of the pattern 4p, a magnetic metal layer 3 for continuously covering the lower faces of the layer 8 and the pattern 5 (partially forming the pattern 3p) and an adhesive layer 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film with a magnetic code suitable for applying a magnetic code which also functions as a reflective layer by sticking or transferring to various objects, and a method for diffusing a magnetic code into a hologram or a diffraction grating. TECHNICAL FIELD The present invention relates to a magnetically coded film having a diffractive favorable / evil figure applied to a structure, and a method for producing these films. The present invention also relates to a sheet with a magnetic code in which the film with a magnetic code or the film with a magnetic code having a diffractive structure is applied to an adherend such as a card.

[0002]

2. Description of the Related Art A metal thin film obtained by vapor deposition or sputtering is applied to a part of a printed material by transfer or the like to give a metallic luster and enhance a printing effect, or light diffraction applied to a surface of a credit card or the like. It is used as a reflective layer in structures.

On the other hand, a magnetic thin film obtained by using a magnetic metal, a magnetic alloy or the like can be used for various applications by providing a magnetic code. As a method suitable for mass replication of this magnetic thin film, if a thick pattern is formed on a plastic film or the like, and then the magnetic thin film is formed, a difference in height occurs in the magnetic thin film, thereby causing an output difference. There is a method of forming a magnetic code of a magnetic thin film by interposing a printing method by utilizing the phenomenon.

When a magnetic code is produced by a printing method according to the above-described method, there is no problem in reading the magnetic code. However, if the plastic film is transparent, the printed pattern portion is viewed from the plastic film side. Since a magnetic thin film is not formed on the, the pattern of the magnetic code can be copied by a copying machine. In addition, since the magnetic thin film also has a metallic luster, it can be used as a reflective layer on the back surface of the light diffraction structure. However, the magnetic code produced through the above printing method is viewed from the plastic film side. Since there is no reflective layer in the printed pattern portion, forming a magnetic code on the back surface of the light diffraction structure by such a method has a disadvantage that the visibility of the light diffraction structure is impaired.

Therefore, Japanese Patent Application Laid-Open No. 2000-33789 discloses a structure in which a support film, an optical diffraction structure or a diffraction grating, a metal reflection layer composed of a magnetic thin film, and a magnetic recording layer are sequentially laminated. There has been proposed a magnetic transfer sheet in which a metal reflective layer made of a magnetic thin film has a coercive force of 300 Oe or less. However, the metal reflective layer made of a magnetic thin film is made of a metal alloy such as Fe, Cr, Ni, or Co, Fe, C, Co, Si, B, or M.
It is made of an alloy such as n in an amorphous state, and although it is said to work well for sensing, it has low light reflectance for use as a metal reflective layer, and the visibility of light diffraction structures and diffraction gratings is low. There is a disadvantage that it cannot be obtained sufficiently.

When the magnetic transfer sheet described in the above publication is used, the magnetic code cannot be copied, but cannot be seen. However, there is a seemingly contradictory requirement that the magnetic code be better visible, in order to facilitate identification of the contents, and yet be impossible to copy.

[0007]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a reflective layer having a magnetic code which is not copyable but which is visible and which has sufficient reflectivity.
And, a light diffraction structure film in which such a reflection layer is applied to a light diffraction structure or the like, or obtained by sticking the light diffraction structure film to an adherend, having a magnetic code, or additionally having a light diffraction structure It is an object to provide a sheet such as a card.

[0008]

According to the study of the inventor, a code pattern is formed by using a magnetic thin film, and a portion other than the code pattern is formed as a metal reflective layer made of a highly reflective metal thin film. Due to the difference in light reflectivity,
Although it is visible to the naked eye, when copying with a copier, the copier has a mechanism to make light incident on the photoconductor using scattered light reflected from the original. It has been found that all of the reflective layers have metallic luster and reflect light so that copying is not possible, leading to the present invention.

In the first invention, a pattern layer is laminated on the lower surface of the transparent base film, and the pattern layer is
A code pattern portion formed by a magnetic metal thin film;
The present invention relates to a film with a magnetic code, comprising a non-code pattern portion formed of a highly reflective metal thin film. According to a second aspect of the present invention, in the first aspect, a thick convex pattern having the same planar shape as the non-code pattern portion is laminated on a lower surface of the non-code pattern portion. The present invention relates to a film with a magnetic code according to claim 1.
A third invention relates to the film with a magnetic code according to the second invention, wherein the magnetic metal thin film is continuously laminated on the code pattern portion, including the lower surface of the convex pattern. is there. In a fourth aspect based on any one of the first to third aspects, the pattern layer comprises:
The present invention relates to a film with a magnetic code, which is releasably laminated to a transparent substrate film.
In a fifth aspect based on the fourth aspect, a protective layer made of a transparent resin is laminated between the transparent substrate film and the pattern layer, and the protective layer is peelable from the transparent substrate film. The present invention relates to a film with a magnetic code, wherein the pattern layer is peelable by being laminated. In a sixth aspect, the first to fifth aspects are described.
In any of the inventions, the present invention further relates to a film with a magnetic code, wherein an adhesive layer is laminated on the entire lowermost surface.

According to a seventh aspect of the present invention, a light diffractive structure layer made of a transparent resin, having a light diffractive structure on the lower surface, and a pattern layer are sequentially laminated on the lower surface of the transparent base film. The present invention relates to a film with a magnetic code having an optical diffraction structure, comprising a code pattern portion formed of a metal thin film and a non-code pattern portion formed of a highly reflective metal thin film. An eighth invention is characterized in that, in the seventh invention, a thick convex pattern having the same planar shape as the non-code pattern portion is laminated on a lower surface of the non-code pattern portion. The present invention relates to a film with a magnetic code having an optical diffraction structure. In a ninth aspect based on the eighth aspect, the magnetic metal thin film is laminated on the entire lower surface of the pattern layer including the lower surface of the convex pattern. It relates to a film with a cord. A tenth invention is directed to any one of the seventh to ninth inventions, wherein the pattern layer is releasably laminated to a transparent substrate film, and relates to a film with a magnetic code having an optical diffraction structure. It is. An eleventh invention is a tenth invention.
In the invention, a protective layer made of a transparent resin is laminated between the transparent substrate film and the light diffraction structure layer, and the protective layer is releasably laminated with the transparent substrate film. And a film with a magnetic code having a light diffraction structure, wherein the light diffraction structure layer is peelable. The twelfth invention relates to the film with a magnetic code having a light diffraction structure according to any one of the seventh to eleventh inventions, further comprising an adhesive layer laminated on the entire lowermost surface. .

According to a thirteenth aspect, a magnetic code film according to any one of claims 1 to 4 or a film with a magnetic code having an optical diffraction structure according to any one of claims 7 to 10 is provided on a base sheet. The present invention relates to a sheet with a magnetic code, wherein a lower surface side is laminated on the base sheet side. A fourteenth invention is a film obtained by removing the transparent base film from the magnetically coded film according to claim 5 or 6, on a base sheet, or
13. A magnetic code comprising: a film with a magnetic code having an optical diffraction structure according to claim 11 or 12, except that the transparent base film is removed, wherein the lower surface side is the base sheet side. It is related to a sheet with a label. The fifteenth invention is directed to the thirteenth or fourteenth invention.
In the invention, the base sheet is a card base, and relates to a sheet with a magnetic code. A sixteenth aspect of the present invention is a paper in which the magnetic code film according to any one of claims 1 to 4 or the film with the magnetic code having the light diffraction structure according to any one of claims 7 to 10 is finely threaded. The present invention relates to a sheet with a magnetic code comprising:

A seventeenth invention is directed to a transparent substrate film,
Forming a highly reflective metal thin film, using a composition having etching resistance on the highly reflective metal thin film, forming a convex pattern consisting of a negative pattern of a magnetic code pattern,
Using the obtained convex pattern as a resist, the high-reflection metal thin film in a portion without the convex pattern is removed by etching, and after the removal, the entire surface on the transparent base film including the convex pattern is removed. And a method of manufacturing a film with a magnetic code, comprising forming a magnetic metal thin film. In an eighteenth aspect, a magnetic metal thin film is formed on a transparent base material film, and a convex pattern composed of a positive pattern of a magnetic code pattern is formed on the magnetic metal thin film using a composition having etching resistance. Then, using the obtained convex pattern as a resist, etching and removing the highly reflective metal thin film of the portion without the convex pattern,
The present invention relates to a method for manufacturing a film with a magnetic code, comprising forming a highly reflective metal thin film on the entire surface of the transparent substrate film including the convex pattern after removal. In a nineteenth aspect based on the seventeenth aspect, prior to forming the highly reflective metal thin film, a light diffractive structure forming layer made of a transparent resin is formed on a transparent base film, and the light diffractive structure forming layer is formed. The present invention relates to a method for producing a film with a magnetic code, wherein a light diffraction structure is formed on the upper surface of a layer for use. In a twentieth aspect based on the eighteenth aspect, prior to forming the magnetic metal thin film, a light diffractive structure forming layer made of a transparent resin is formed on a transparent base film, and the light diffractive structure forming layer is formed. And a method of manufacturing a film with a magnetic code, wherein an optical diffraction structure is formed on the upper surface of the film. The twenty-first invention is a seventeenth to a second invention.
0. In any one of the inventions, the present invention relates to a method for producing a film with a magnetic code, wherein a transparent base film having a releasable upper surface is used. The twenty-second invention relates to the method of manufacturing a film with a magnetic code according to any one of the seventeenth to twenty-first inventions, further comprising forming an adhesive layer on the entire top surface.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a film 1 with a magnetic code according to the present invention most basically has a code pattern 3p made of a magnetic metal thin film, A pattern layer P (= layer having a code pattern) composed of a non-code pattern 4p composed of a reflective metal thin film is laminated. In addition to being magnetically readable, the pattern layer P is such that, when light is incident, the light reflected on the code pattern 3p made of a magnetic metal thin film and the non-code pattern made of a highly reflective metal thin film in reflected light. 4p, reflected light is generated, which is visible based on the difference in reflectance, and the code pattern can be read by a machine. After being incident on, to use light that is diffusely reflected,
Any part of the pattern layer is blackened and not copied. The film 1 with a magnetic code as shown in FIG. 1 may be used by attaching the lower surface side to an adherend or may be used by attaching the upper surface side to an adherend. In consideration of the durability of the highly reflective metal thin film 4, it is more preferable to use the lower surface side by attaching it to the adherend.

A film 1 with a magnetic code as shown in FIG. 1 is formed by patterning the thin film by using a mask at the time of forming the thin film, or by repeating a process of etching the uniformly formed thin film using a resist. 2 (a) or FIG.
With the structure as shown in (b), it can be formed by a more rational method.

That is, as shown in FIG. 2A, a film 1 with a magnetic code according to the present invention comprises a non-code pattern 4 made of a highly reflective metal thin film 4 on the lower surface of a transparent base film 2.
p, and a convex pattern 5 is further laminated on the lower surface of the non-code pattern 4p.
The magnetic metal thin film 3 is entirely laminated on both the lower surface of the lower surface of the non-code pattern 4p and the lower surface of the convex pattern 5. The portion of the magnetic metal thin film 3 directly laminated on the transparent substrate film 2 becomes the code pattern 3p.

Alternatively, as shown in FIG. 2 (b), the film 1 with a magnetic code of the present invention has a code pattern 3p made of a magnetic metal thin film 3 laminated on the lower surface of a transparent base material film 2; 3, a convex pattern 5 'is further laminated on the lower surface of the transparent substrate film 2.
The high-reflection metal thin film 4 is entirely laminated on both the lower surface of the portion where the code pattern 3p is not laminated and the lower surface of the convex pattern 5 ′. Good.

The film 1 with a magnetic code as shown in FIG. 2A or 2B is obtained by forming each metal thin film in a pattern by a vapor deposition method or a sputtering method using a mask. Alternatively, it can be manufactured by patterning the metal thin film with a resist work for each metal thin film.
A film 1 with a magnetic code as shown in FIG.
Can be more efficiently manufactured by the following manufacturing method described with reference to In the description of the manufacturing method, the transparent base film 2 will be described with reference to the drawing as the lowermost layer side.

First, a transparent base film 2 is prepared (FIG. 3).
(A)) The highly reflective metal thin film 4 is laminated on the transparent substrate film 2 on one surface (FIG. 3 (b)). On the highly reflective metal thin film 4, a convex pattern 5 is laminated on a portion corresponding to the non-code pattern 4p in FIG. 2A by using a composition having etching resistance (FIG. 3C). ). Subsequently, etching is performed using the convex pattern 5 as a resist, and the high-reflection metal thin film 4 in the portion without the convex pattern 5 (that is, the portion of the code pattern 3p) is removed by etching. The material film 2 is exposed (FIG. 3D). Finally, the magnetic metal thin film 3 is laminated on the entire surface including the exposed portion (the portion of the code pattern 3p) of the transparent base film 2 and the convex pattern 5 of the non-code pattern 4p.

According to the above manufacturing method, a film having a visible magnetic code, in which the code pattern 3p made of the magnetic metal thin film 3 and the non-code pattern 4p made of the highly reflective metal thin film 4 are formed, is obtained. In addition, even if the metals constituting the thin films are different, no gap is formed between the two thin films, so that light can be reflected from any portion. Further, in the portion of the non-code pattern 4p, the total thickness of the highly reflective metal thin film 4 and the convex pattern 5 (substantially,
Equal to the latter thickness. ), The magnetic metal thin film 3 exists on the back side, so that the magnetic output is different corresponding to the thickness. Therefore, even if the magnetic metal thin film 3 itself is formed continuously, it can be used as a magnetic code. Can be detected.
In addition, by polishing the upper surface of the one obtained by the above manufacturing method, the magnetic metal thin film on the upper surface of the convex pattern 5 or a part of the convex pattern can be removed, so that the magnetic code can be detected more reliably. Become.

Although not shown, the magnetic-corded film 1 as shown in FIG. 2 (b) corresponds to a code pattern 3p by laminating a magnetic metal thin film 3 on a transparent base film 2 first. The convex pattern 5 ′ is laminated at the position, and etching is performed using the convex pattern 5 ′ as a resist.
After removing the magnetic metal thin film 3 in the portion of the non-code pattern 4, the highly reflective metal thin film 4 is laminated on the entire surface,
Can be manufactured.

Also according to this manufacturing method, a code pattern 3p made of the magnetic metal thin film 3 and a non-code pattern 4p made of the highly reflective metal thin film 4 are formed when viewed from the transparent base film 2 side. A film having the resulting magnetic code is obtained. However, according to this manufacturing method, the magnetic metal thin film 3 is left only in the portion of the code pattern 3p and is removed in other portions, so that a magnetic code is formed depending on the presence or absence of the magnetic metal thin film 3.

In place of the formation of the convex pattern, after printing with a swellable ink, a metal thin film is formed.
Developing with a solvent capable of swelling the ink can remove the metal thin film on the portion printed with the swellable ink (= lift-off development), and thus such a method may be used.

As described above, the film 1 with the magnetic code formed of the pattern of the magnetic metal thin film 3 and the highly reflective metal thin film 4 has a large economic loss if counterfeited or falsified with a credit card or the like. It can be used by pasting it on something, etc., but it can be further modified to make it easier to use or improve its function as follows. For example, between the transparent base film 2 and the pattern layer P including the code pattern 3p and the non-code pattern 4p of the film 1 with a magnetic code as shown in FIGS. By doing so, the pattern layer P can be transferred onto an arbitrary adherend. This is a so-called transfer sheet structure.

When the transfer sheet having a laminated structure is applied to an adherend, the code pattern 3p and the non-code pattern 4p are exposed. A protective layer 7 may be laminated between the material film 2 and the pattern layer P including the code pattern 3p and the non-code pattern 4p (FIG. 4B). In this case, the peeling is performed between the transparent base film 2 and the protective layer 7.

Transparent base film 2 and code pattern 3
p and a non-code pattern 4p
The adhesive layer 6 may be laminated on the side of the magnetic code film 1 opposite to the side on which the transparent substrate 2 is located, regardless of whether or not the adhesive layer 6 can be peeled off. In the case where the transparent base film 2 is peelable, the protective layer 7
(FIGS. 4A and 4B).

The pattern layer P composed of the code pattern 3p and the non-code pattern 4p is preferably used as a light reflection layer in combination with a light diffraction structure or a light diffraction structure of a diffraction grating. As shown in FIG. 5 (a), the transparent substrate 2 having a structure as shown in FIG.
And a pattern layer P including a code pattern 3p and a non-code pattern 4p, a light diffraction structure layer 8 having a light diffraction structure or a light diffraction structure of a diffraction grating is laminated to form a magnetic code having a light diffraction structure. It can be a film 1 with a. Thus, the lamination of the light diffraction structure 8 may be applied to the structure shown in FIG. 2B or FIG. 1 other than the structure shown in FIG.

When the film 1 with the magnetic code having the light diffraction structure layer 8 is applied to an adherend, there are a case where the film is directly attached to the adherend and a case where the transparent substrate film 2 is peeled off and transferred. In the latter, after the transfer, the pattern layer P composed of the code pattern 3p and the non-code pattern 4p is exposed.
And the pattern layer P composed of the code pattern 3p and the non-code pattern 4p, and it is preferable to separate the transparent base film 2 and the protective layer 7 from each other.

As described above, the adhesive layer 6 may be laminated on the lowermost layer in the film 1 with the magnetic code having the light diffraction structure.

The magnetic code-added film 1 having the light diffraction structure as described above is obtained by forming the highly reflective metal thin film 4 on the transparent base film 2 in the manufacturing method described with reference to FIG.
Before laminating the light diffractive structure, a light diffractive structure forming layer is laminated using a transparent resin material suitable for forming the light diffractive structure, and fine irregularities of the light diffractive structure are formed on the upper surface thereof by embossing or the like. The diffraction structure layer 8 can be additionally manufactured. Alternatively, in the manufacturing method in which the magnetic metal thin film is formed first, before the magnetic metal thin film 3 is laminated,
The light diffraction structure layer 8 is formed as described above. When the transparent substrate film 2 is peeled, the upper surface of the transparent substrate film 2 is made to be peelable, or after forming a peelable layer that peels off together with the light diffraction structure on the transparent substrate film 2, It is preferable to form the diffraction structure layer 8.

Each of the films 1 with a magnetic code and the film 1 with a magnetic code having an optical diffraction structure described above can be applied to an appropriate adherend as illustrated in FIG. Can be. For example, a film 1 with a magnetic code as shown in FIG. 4B is overlaid and adhered on the base sheet 12 such that the adhesive layer 6 side is the base sheet 12 side, and the transparent base film 2 is bonded. Can be applied by peeling off, in this case, FIG.
The magnetic code sheet 11 as shown in FIG.
Although the above example is an example of transfer using the film 1 with a magnetic code, the protective layer 7 may be omitted in some cases, or it may be laminated with the transparent substrate 2 attached.

Alternatively, as shown in FIG.
The film 1 with the magnetic code having the light diffractive structure layer 8 as shown in FIG. 1 is overlapped and adhered so that the adhesive layer 6 side is on the substrate sheet 12 side, and the transparent substrate film 2 is peeled off. In this case, FIG.
The magnetic code sheet 11 as shown in FIG.

When the film 1 with a magnetic code or the film 1 with a light diffraction structure has no adhesive layer 6, when the film is laminated or transferred,
Laminating or transferring after applying an adhesive layer on the substrate sheet 11 as an adherend or / and on the lower surface of the film 1 with a magnetic code (or the film 1 with a magnetic code having an optical diffraction structure). Can be.

The materials constituting each layer in the above description and the method of forming them will be further described below.

As the transparent base film 2, heat resistance, strength, especially tensile strength, in the steps of forming the magnetic metal thin film 3, forming the highly reflective metal thin film 4, forming the convex pattern 5, or etching, etc. Those having resistance to an etching solution and the like are desirable. Further, when the film with the magnetic code is applied on another adherend, when the transparent base film 2 is stuck without being peeled off, transparency is required. When a film with a magnetic code is configured as a transfer sheet, it is not always necessary to be transparent, but since the formation of each layer is easy to confirm, a transparent one is easier to handle. As described later, the transparent substrate film 12 may be releasable by laminating a release layer as necessary.

Specifically, a polypropylene resin film, a polycarbonate resin film, a polyethylene terephthalate resin film or the like is preferable, and among them, a biaxially stretched polyethylene terephthalate resin film having excellent mechanical strength is suitable. In the case of an axially stretched polyethylene terephthalate resin film,
The thickness is preferably from 5 to 250 μm, more preferably from 10 to 50 μm.

The material of the highly reflective metal thin film 4 constituting the pattern layer P is Mg, Al, Ti, Cr, Cu, Z
n, Ga, Ge, Se, Rb, Pd, Ag, Cd, I
A metal such as n, Sn, Sb, Te, Au, Pb, or Bi, or an oxide or nitride thereof is used alone or in combination to form a thin film. Of these, Al, Cr, Ni, Ag, or A
u and the like are particularly preferred.

The material of the magnetic metal thin film 3 constituting the pattern layer P is preferably made of a metal of Fe, Co, or Ni, or an alloy containing two or three of these metals.

Highly reflective metal thin film 4 constituting pattern layer
The magnetic metal thin film 3 is formed by a known thin film forming method such as a vacuum evaporation method, a sputtering method, or an ion plating method.
0 nm to 200 nm is preferable, and 50 nm is more preferable.
nm to 100 nm.

The convex pattern 5 is a highly reflective metal thin film 4
(Or the magnetic metal thin film 3) as an etching resist, and to produce a gap between the magnetic metal thin film 3 and the transparent substrate film 2 to cause a change in magnetic output. Although the required gap depends on the material constituting the magnetic metal thin film 3, it is 1.0 μm to 1.0 μm.
It is preferably about 5.0 μm. When the thickness is less than the lower limit, the difference in magnetic output is small, and when the thickness exceeds the upper limit, the difference in magnetic output occurs. However, when the thickness is excessive, transfer to another adherend is attempted by sticking. This is because unevenness caused by the presence and absence of uneven portions cannot be absorbed by the thickness of the adhesive layer or the like.

Such a convex pattern 5 can be formed by printing with a large amount of embossment, for example, by using a method of silk screen printing, intaglio printing, or gravure printing, which is a printing method with a large amount of ink transfer. It is preferable to use an ink having a high solid content so that the transferred ink does not shrink due to drying.

As the ink having a high solid content, it is preferable to use an ink having a relatively large resin content and containing a large amount of a filler. Examples of the filler include organic fillers such as acrylic resin and polystyrene resin. One or more of inorganic fillers such as silica, alumina, calcium carbonate and barium sulfate are selected and used. Among them, it is particularly preferable to use silica because it is easy to form a rough surface by being repelled from the ink vehicle. These fillers, based on the resin content of the ink,
It is preferable to mix and use 10 to 50%, preferably 25 to 35% (all on a mass basis).

As the binder resin in the ink for forming the convex pattern 5, an ethylene-vinyl acetate copolymer resin,
Vinyl chloride-vinyl acetate copolymer resin, polyvinyl chloride resin, polyvinyl formal resin, polyvinyl butyral resin, polyvinyl alcohol resin, polyvinylidene chloride resin, polyvinyl acetate resin, polystyrene resin, styrene-acrylonitrile copolymer resin, acrylonitrile-
Butadiene-styrene copolymer resin, polymethyl methacrylate resin, methyl methacrylate-styrene copolymer resin,
Polycarbonate resin, ethyl cellulose resin, propyl cellulose resin, cellulose acetate resin, cellulose acetate butyrate, cellulose nitrate resin, polychlorofluoroethylene resin, polytetrafluoroethylene resin, tetrafluoroethylene-hexafluoroethylene copolymer resin, polyvinylidene fluoride resin, Thermoplastic polyurethane resin,
A thermoplastic resin such as a polyamide resin (nylon-6, -66, -610, or -11), a polyethylene terephthalate resin, a polybutylene terephthalate resin, a polycyclohexane terephthalate resin, or a novolac phenol resin can be used.

Alternatively, as the binder resin, in addition to the above-mentioned thermoplastic resin, a thermosetting resin such as a resol type phenol resin, a urea resin, a melamine resin, a polyurethane resin, an epoxy resin, or an unsaturated polyester resin, or a protein may be used. And natural resins such as rubber, shellac, copal, starch and rosin.

The convex pattern 5 is formed by using the printing method described above, and the line width of the convex pattern 5 is 1.0 mm to 20 m.
m, line spacing; 1.0 mm to 50 mm, line length;
A printing plate is prepared, printed, and formed to have a thickness of 0 mm to 2000 mm.

In the present invention, after the highly reflective metal thin film 4 and the convex pattern 5 are sequentially formed on the transparent base film 2, etching is performed using the convex pattern 5 as a resist. As the etchant, a known acidic or alkaline etchant is selected and used according to the material of the metal constituting the highly reflective metal thin film 4 to be etched. When an aluminum thin film, which is a typical reflection layer of a light diffraction structure such as a hologram or a diffraction grating, is used as the highly reflective metal thin film 4, an alkaline solution is used.

In the present invention, in addition to the above process, after the magnetic metal thin film 3 and the convex pattern 5 are sequentially formed on the transparent base film 2, etching may be performed using the convex pattern 5 as a resist. When Fe is used as the magnetic metal thin film, for example, an aqueous solution of sodium hydroxide as an alkaline etching solution is used.

When the film with a magnetic code of the present invention or the film with a magnetic code having an optical diffraction structure has the structure of a transfer sheet, when the transparent base film 2 and the pattern layer P And light diffraction structure layer 8
In order to make the peeling between the transparent substrate film 2 and the protective layer smooth between the transparent substrate film 2 and the protective layer, and to bond the respective layers to be transferred with an appropriate adhesive force before the transfer,
It is preferable to laminate a release layer between them to make the transparent substrate film 2 releasable.

The resin constituting the release layer depends on the material of the transparent substrate film 2 which is the base material of the transfer sheet and the material of the layer to be adhered to the release layer. A vinyl acetate copolymer resin, a two-component blend resin of cellulose acetate and a thermosetting acrylic resin, a melamine resin, or a nitrocellulose resin can be used. For example, when the transparent substrate film 2 is a polyethylene terephthalate resin film,
A polyester resin is preferred in terms of adhesion between the release layer and the transparent substrate film 2. A wax such as polyethylene wax or a silicone resin may be further added to these resins to improve the releasability. The release layer can be formed by dissolving or dispersing the above resin using an appropriate solvent or dispersant to prepare a composition suitable for coating or printing, and by a known coating method.
The thickness of the layer is about 0.5 μm to 5 μm.

When the film with a magnetic code of the present invention or the film with a magnetic code having an optical diffraction structure has the structure of a transfer sheet, a protective layer 7 is formed to improve the durability of the surface after transfer. May be. Protective layer 7
The resin constituting the above is preferably a resin having transparency and having durability such as scratch resistance, abrasion resistance, heat resistance, chemical resistance, and stain resistance.

As a specific resin constituting the protective layer 7, a thermoplastic resin or a thermosetting resin can be used, but when a higher protective function is required, an ionizing radiation-curable resin is preferable. Specific examples of ionizing radiation-curable resins include polyurethane acrylate, polyester acrylate, epoxy acrylate, and polyether acrylate. These are polyfunctional or monofunctional to adjust the viscosity or crosslink density of each prepolymer. And a known photoreaction initiator and sensitizer may be added as necessary. In addition, polyene / thiol-based ionizing radiation-curable resins and the like also have excellent abrasion resistance and can be preferably used.

If necessary, additives such as a surfactant, an antistatic agent, and an ultraviolet absorber may be added to the resin for forming the protective layer 7. Also, a small amount of wax or the like may be added in order to secure the slipperiness of the surface. In addition, the method for providing the protective layer 7 includes adding a diluent or a solvent to the resin for forming the protective layer, mixing or dispersing the diluent or the solvent to prepare a coating liquid for forming the protective layer, and various conventionally known roll coating methods. After application by the gravure coating method, the resin can be cured by UV (ultraviolet) irradiation or EB (electron beam) irradiation to form a protective layer. When an organic solvent is added to the coating solution, it is preferable that after application, first, hot-air drying is performed to remove the organic solvent, and then the resin is cured by irradiation with UV or EB.

The thickness of such a protective layer 7 is 0.5 to
It is preferable that the thickness be in the range of 4.0 μm. When the thickness of the protective layer is less than 0.5 μm, sufficient abrasion resistance and abrasion resistance cannot be obtained. On the other hand, when the thickness exceeds 4.0 μm, the abrasion resistance is already sufficient. There is no.

The adhesive layer 6 occupies the lower layer of the magnetic-cored film of the present invention or the magnetic-cord film having an optical diffraction structure, has good adhesiveness with the upper layer, and has good adhesion to the adherend. It is preferable to be able to exhibit strong adhesive strength. Specifically, the adhesive layer 6 is made of a vinyl chloride resin, a vinyl acetate resin, a vinyl chloride-vinyl acetate copolymer resin, an acrylic resin, a polyester resin,
It is composed of a material appropriately selected from polyurethane-based resin, polyamide-based resin, modified rubber and the like. These may be used alone or in a mixed system of two or more kinds, and may be used by adding a hard resin, a plasticizer, and other additives as necessary.

The adhesive layer 6 is formed by dissolving or dispersing the above-mentioned materials with an appropriate solvent or dispersant to prepare a coating composition, coating and drying by a known coating method such as a roll coating method. The thickness of the adhesive layer 6 is 0.5 μm to 5 μm.
m, more preferably 1.5 μm to 3 μm.

* The light diffraction structure layer 8 is formed by forming a light diffraction structure such as a hologram or a diffraction grating on a layer made of a synthetic resin, usually as fine irregularities. Planar holograms and volume holograms can be used as typical holograms of the optical diffraction structure. Specific examples include relief holograms, Lippmann holograms, Fresnel holograms, Fraunhofer holograms, lensless Fourier transform holograms, laser reproduction holograms (images) Hologram), white light reproduction hologram (rainbow hologram, etc.), color hologram, computer hologram, hologram display, multiplex hologram, holographic stereogram, holographic diffraction grating, and the like. Light diffraction structure layer 8
In addition to having an apparent pattern, when the light diffraction structure layer 8 is formed so as to generate a diffractive optical code when it is irradiated with a laser beam, the anti-counterfeit effect can be obtained by using the magnetic code together. Is improved.

The synthetic resin forming the light diffraction structure layer 8 includes polyvinyl chloride, acrylic resin (eg, PMMA),
Thermoplastic resins such as polystyrene and polycarbonate,
Unsaturated polyester, melamine, epoxy, polyester (meth) acrylate, urethane (meth) acrylate, epoxy (meth) acrylate, polyether (meth) acrylate, polyol (meth) acrylate,
Thermosetting resins such as melamine (meth) acrylate and triazine acrylate can be used alone or in combination with the thermoplastic resin and the thermosetting resin. Further, radical polymerizable unsaturated groups can be used. It is possible to use a thermoformable substance having the composition or a substance obtained by adding a radical polymerizable unsaturated monomer to the composition to make the composition curable with ionizing radiation. In addition, silver salts, gelatin dichromate, thermoplastics, diazo photosensitive materials, photoresists,
Photosensitive materials such as ferroelectrics, photochromic materials, thermochromic materials, and chalcogen glass can also be used.

The light diffractive structure such as a hologram can be formed on the layer made of the synthetic resin by using a material described above and a conventionally known method. For example, when recording an interference fringe of a diffraction grating or a hologram as a relief of surface irregularities, an original having the diffraction grating or the interference fringes recorded in the form of irregularities is used as a press mold, and the original is superimposed on the resin layer. By heating and pressing the both by appropriate means such as a heating roll, the concavo-convex pattern of the original plate can be duplicated. When a photopolymer is used, a photopolymer can be coated on the protective layer of the laminated sheet in the same manner, and then the original can be overlapped and irradiated with a laser beam to perform replication.

As described above, the method of recording the interference fringes of the diffraction grating or the hologram on the surface of the light diffraction structure layer as the relief of the surface unevenness is particularly preferable since it has mass productivity and can reduce the cost. The thickness of such a light diffraction structure layer is 0.5
It is preferably in the range of 6 to 6 m, more preferably in the range of 1 to 4 m.

The magnetic code film of the present invention or the film with a magnetic code having an optical diffraction structure can be formed by bonding the lower surface of the magnetic code film to an appropriate base sheet 12 and laminating it, or when transferring, it is transparent. By removing the base film 2 at the time of lamination, a sheet with a magnetic code (including a case having an optical diffraction structure) can be obtained, and the effect that the base sheet 12 can prevent forgery and alteration is enhanced. be able to.

Examples of the base sheet 12 include resin sheets such as polyvinyl chloride, polyester, polycarbonate, polyamide, polyimide, cellulose diacetate, cellulose triacetate, polystyrene, acryl, polypropylene, and polyethylene, and aluminum, copper, and the like. Metal foil, paper, and impregnated paper such as resin or latex, etc., or a sheet obtained by combining any of the above various sheets arbitrarily can be used. When the base sheet 12 is paper, the magnetic code film can be formed into a fine thread form (= fiber form) by making it into a fine thread form (= fiber form) at the time of paper making to form a magnetic code sheet. When used as a material sheet, the base sheet already has a forgery prevention effect. Therefore, when used in combination with other forgery prevention means, the forgery prevention effect is further improved. When heat resistance is required, a sheet of an amorphous polyester resin or a blend resin of an amorphous polyester resin and a polycarbonate resin can be used as a material of the base sheet 12.

The thickness of the base sheet 12 varies depending on the material, but is usually in the range of about 10 μm to 5 mm. The base sheet 12 may be a card.
Here, the card may have a portable size, in particular, a card having a size of 86 mm × 54 mm such as a credit card or a savings card. Usually, in the case of conforming to the ISO standard, the thickness is 0.76 mm. When the base sheet is formed of polyvinyl chloride (hereinafter, referred to as PVC), usually, a white PVC sheet having a thickness of 280 μm is used as a core sheet, two of which are stacked, and a transparent PVC sheet having a thickness of 100 μm is provided on both sides thereof. Are used as an oversheet, and a four-layered base sheet (total thickness 0.76 mm) is laminated by hot pressing or the like.

The base sheet 12 and / or the inside of the base sheet 12 may be appropriately printed or the like. The base sheet 12 has a magnetic recording layer, an IC,
Recording means for a module, an optical recording layer, a writable layer, or embossed characters may be provided. Therefore, these base sheets 12 are themselves, such as stock certificates, securities, gift certificates, vouchers, or the like, having a monetary value equal to or greater than the face value depending on the social situation, a credit card, or a savings / depositing card. Items that have no monetary value but have a large financial loss when used illegally, high-priced products such as branded products, copyrighted works such as video software and game software, etc. ,
Alternatively, other than these, it can be used by directly pasting it on a product requiring proof of authenticity, or pasting it on its case or the like.

[0063]

According to the first aspect of the present invention, since the reflection layer is constituted by the pattern layer of the magnetic metal thin film and the highly reflective metal thin film, the magnetic layer has a magnetic code which can be visually checked and machine-readable. It is possible to provide a film with a magnetic code that also has continuous reflection. According to the second aspect of the present invention, in addition to the effect of the first aspect, since the convex pattern is laminated below the non-code pattern, it is easy to form the magnetic metal thin film at a predetermined position. Can be provided. According to the third aspect of the present invention, in addition to the effect of the first aspect of the present invention, since the structure has a magnetic metal thin film on the entire lower surface,
At the time of manufacture, without considering the position where the magnetic metal thin film should be formed,
A film with a magnetic code having a structure suitable for forming a magnetic metal thin film on one surface can be provided. According to the fourth aspect of the invention, in addition to the effects of the first to third aspects, the pattern layer and, when the lower layer is present, the lower layer can be transferred onto another adherend. A magnetic film with a magnetic code can be provided. Claim 5
According to the invention, in addition to the effect of the invention of claim 4, it is possible to provide a film with a magnetic code which can protect the surface after transfer and can be transferred together with the protective layer. According to the invention of claim 6, in addition to the effects of any one of claims 1 to 5, the adhesive layer is laminated on the lowermost layer, so that it is pasted or transferred onto another adherend. At this time, it is possible to provide a film with a magnetic code that can be used without applying an adhesive to the lower surface of the transfer sheet and / or the adherend. According to the seventh aspect of the present invention, since the light diffraction structure layer is provided between the transparent base film and the pattern layer of the film with a magnetic code according to the first aspect of the present invention, visual confirmation and machine reading are also possible. In addition to the above magnetic code, it is possible to provide a film with a magnetic code having a light diffractive structure having a more complicated structure in which the fine appearance of the light diffractive structure layer is added. Further, when the light diffraction structure layer is provided with a diffraction optical code, it is possible to provide a film with a magnetic code having a light diffraction structure capable of optically reading the diffraction optical code. According to the invention of claim 8, in addition to the effect of the invention of claim 7, since the convex pattern is laminated below the non-code pattern, it is easy to form the magnetic metal thin film at a predetermined position. , A film with a magnetic code having a light diffraction structure can be provided. According to the ninth aspect of the present invention, in addition to the effect of the eighth aspect of the present invention, a structure having a magnetic metal thin film on the entire lower surface is provided. It is possible to provide a magnetic-corded film having an optical diffraction structure capable of forming a magnetic metal thin film on one surface. According to the tenth aspect, in addition to the effects of any of the seventh to ninth aspects,
It is possible to provide a magnetic-cored film having a light diffraction structure that can be transferred onto another adherend, including the light diffraction structure layer, the pattern layer, and the lower layer, if present. According to the eleventh aspect of the present invention, in addition to the effect of the tenth aspect, a magnetic code having a light diffractive structure is provided, which can protect the surface after transfer and can transfer the protective layer together. A film can be provided. According to the invention of claim 12, claims 7 to 11 are provided.
In addition to the effects of any one of the inventions, since the adhesive layer is laminated on the lowermost layer, it is bonded to the lower surface of the transfer sheet and / or to the adherend when pasting or transferring onto another adherend. It is possible to provide a film with a magnetic code having a light diffraction structure that can be used without applying an agent. According to the invention of claim 13, on the base sheet, the film with a magnetic code according to any one of claims 1 to 4,
Alternatively, since a film with a magnetic code having any of the optical diffraction structures of 7 to 10 is laminated, a sheet with a magnetic code with a high effect of preventing forgery or falsification can be provided. According to the invention of claim 14,
The film with a magnetic code according to claim 5 or 6, or the film with a magnetic code having an optical diffraction structure according to any one of claims 11 or 12, is forged or falsified because a material other than the transparent substrate film is transferred. It is possible to provide a sheet with a magnetic code, which is highly effective in preventing the occurrence of a sheet. According to the fifteenth aspect, a card having the same effect as the thirteenth or fourteenth aspect can be provided. According to the invention of claim 16, the film with a magnetic code according to any one of claims 1 to 4 or the film with a magnetic code having any of the optical diffraction structures according to any of claims 7 to 10 is cut into paper as fine thread-like pieces. The use of the magnetic sheet allows the provision of a sheet with a magnetic code having a high effect of preventing forgery or falsification. According to the seventeenth aspect of the present invention, a film with a magnetic code as described in the third aspect is formed with a highly reflective metal thin film, a convex pattern composed of a negative pattern of a magnetic code, etched, and a magnetic metal thin film. By successively forming the films, it is possible to provide an efficient and stable method for producing a film with a magnetic code. According to the eighteenth aspect of the present invention, the formation of a magnetic metal thin film, the formation of a convex pattern composed of a positive pattern of a magnetic code, the etching, and the formation of a highly reflective metal thin film are sequentially performed, thereby achieving an efficient and stable operation. A method for producing a film with a magnetic code can be provided. According to the nineteenth aspect, in addition to the effect of the seventeenth aspect, since the light diffraction structure layer is formed prior to forming the highly reflective metal thin film, the pattern layer serves as a reflection layer of the light diffraction structure layer. It is possible to provide a method for producing a film with a magnetic code having an optical diffraction structure, which also takes into consideration the point that it functions. According to the twentieth aspect, in addition to the effect of the eighteenth aspect, since the light diffraction structure layer is formed before the magnetic metal thin film is formed, the pattern layer also functions as a reflection layer of the light diffraction structure layer. Is taken into account,
A method for producing a film with a magnetic code can be provided. According to the invention of claim 21, in addition to the effects of any one of claims 17 to 20, in addition to using the transparent substrate having a releasable upper surface, the transparent substrate film and each layer to be transferred can be used. It is possible to provide a method for manufacturing a film with a magnetic code having an optical diffraction structure, which takes into consideration the point that the film can be peeled. According to the invention of claim 22, in addition to the effect of any one of claims 17 to 21, an adhesive layer is formed, so that it is possible to eliminate the need to newly apply an adhesive when applying to an adherend. It is possible to provide a method for producing a magnetic-cored film having an optical diffraction structure.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a film with a magnetic code.

FIG. 2 is a cross-sectional view of a film with a magnetic code having a convex pattern.

FIG. 3 is a diagram showing a manufacturing process of a film with a magnetic code.

FIG. 4 is a cross-sectional view of a film with a magnetic code having a protective layer and an adhesive layer.

FIG. 5 is a cross-sectional view of a film with a magnetic code having a light diffraction structure layer.

FIG. 6 is a sectional view of a sheet with a magnetic code.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Film with magnetic code 2 Transparent base film 3 Magnetic metal thin film (3p; code pattern) 4 Highly reflective metal thin film (4p; non-code pattern) 5 Convex pattern 6 Adhesive layer 7 Protective layer 8 Light diffractive structure layer 11 Sheet with magnetic code 12 Base sheet

Continued on front page F-term (reference) 2C005 HA04 HA13 HB09 JA03 KA07 KA11 4F100 AB01B AK01D AK01E AK07A AK25E AK42A AK45A AT00A BA03 BA04 BA05 BA07 BA10A BA10C BA10D CB00 DD03C DG10A01 JHB EJ152B01 H06 EJ152B01 JH13 JN06B JN30E 4L055 AG99 AH50 AJ02 BE14 FA30 GA45 5B035 AA00 BA05 BB02 BB05 BB12 BC00

Claims (22)

[Claims] 1. A pattern layer is laminated on a lower surface of a transparent substrate film. The pattern layer includes a code pattern portion formed by a magnetic metal thin film and a non-code pattern formed by a highly reflective metal thin film. A film with a magnetic code, comprising: 2. The magnetic device according to claim 1, wherein a thick convex pattern having the same planar shape as the non-code pattern portion is laminated on a lower surface of the non-code pattern portion. Corded film. 3. The film with a magnetic code according to claim 2, wherein the magnetic metal thin film including the lower surface of the convex pattern is continuously laminated with the code pattern portion. 4. The pattern layer according to claim 1, wherein the pattern layer is releasably laminated to a transparent substrate film.
3. The film with a magnetic code according to any one of 3. 5. A protective layer made of a transparent resin is laminated between the transparent substrate film and the pattern layer, and the protective layer is releasably laminated to the transparent substrate film, The film with a magnetic code according to claim 4, wherein the pattern layer is peelable. 6. The film with a magnetic code according to claim 1, wherein an adhesive layer is further laminated on the entire lowermost surface. 7. A light diffractive structure layer made of a transparent resin, having a light diffractive structure on the lower surface, and a pattern layer are sequentially laminated on the lower surface of the transparent substrate film, and the pattern layer is formed of a magnetic metal thin film. And a non-code pattern portion formed of a highly reflective metal thin film. 8. The light according to claim 7, wherein a convex pattern having the same planar shape as the non-code pattern portion and having a large thickness is laminated on a lower surface of the non-code pattern portion. A film with a magnetic code having a diffractive structure. 9. The film with a magnetic code having an optical diffraction structure according to claim 8, wherein the magnetic metal thin film including the lower surface of the convex pattern is continuously laminated with the code pattern portion. . 10. The pattern layer according to claim 7, wherein the pattern layer is releasably laminated to a transparent substrate film.
A film with a magnetic code having the light diffraction structure according to any one of claims 9 to 9. 11. A protective layer made of a transparent resin is laminated between the transparent substrate film and the light diffraction structure layer, and the protective layer is releasably laminated to the transparent substrate film. The film with a magnetic code having a light diffraction structure according to claim 10, wherein the light diffraction structure layer can be peeled off. 12. The film with a magnetic code having an optical diffraction structure according to claim 7, wherein an adhesive layer is further laminated on the entire lowermost surface. 13. A magnetic code film according to claim 1 or a film with a magnetic code having an optical diffraction structure according to claim 7 on a substrate sheet, wherein the underside of the magnetic code film has A sheet with a magnetic code, which is laminated so as to be on the material sheet side. 14. The method according to claim 5, wherein the base sheet is provided on the base sheet.
What removed the transparent substrate film from the film with a magnetic code according to the above, or what removed the transparent substrate film from the film with a magnetic code having an optical diffraction structure according to claim 11 or 12, the lower surface side A sheet with a magnetic code, which is laminated so as to be on the base sheet side. 15. The sheet with a magnetic code according to claim 13, wherein the base sheet is a card base. 16. A magnetic cord film according to any one of claims 1 to 4, or a film with a magnetic code having an optical diffraction structure according to any one of claims 7 to 10, which is formed as fine thread-like pieces from laid paper. Sheet with magnetic code. 17. A convex pattern comprising a negative pattern of a magnetic code pattern, wherein a highly reflective metal thin film is formed on a transparent substrate film, and a composition having etching resistance is formed on the highly reflective metal thin film. A pattern is formed, and the obtained convex pattern is used as a resist, and the highly reflective metal thin film in a portion having no convex pattern is removed by etching. After the removal, the transparent base material including on the convex pattern is removed. A method for producing a film with a magnetic code, comprising forming a magnetic metal thin film on the entire surface of the film. 18. A magnetic metal thin film is formed on a transparent base material film, and a convex pattern composed of a positive pattern of a magnetic code pattern is formed on the magnetic metal thin film using a composition having etching resistance. Using the obtained convex pattern as a resist, etching and removing the highly reflective metal thin film in the portion without the convex pattern, and after removal, the entire surface on the transparent base film including on the convex pattern And a method of manufacturing a film with a magnetic code, comprising forming a highly reflective metal thin film. 19. A light diffractive structure forming layer made of a transparent resin is formed on a transparent base film prior to forming a highly reflective metal thin film, and a light diffraction structure is formed on an upper surface of the light diffractive structure forming layer. The method for manufacturing a film with a magnetic cord according to claim 17, wherein the structure is formed. 20. Prior to forming a magnetic metal thin film,
19. A magnetic code according to claim 18, wherein a light diffraction structure forming layer made of a transparent resin is formed on the transparent base film, and a light diffraction structure is formed on the upper surface of the light diffraction structure forming layer. Film production method. 21. The film according to claim 17, wherein an upper surface of the film is releasable.
21. The method for producing a film with a magnetic code according to any one of claims to 20. 22. The method according to claim 17, further comprising forming an adhesive layer on the entire top surface.